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https://issues.apache.org/jira/browse/CASSANDRA-8739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14307164#comment-14307164
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Marcus Eriksson commented on CASSANDRA-8739:
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we pick a bunch of files for compaction (those are not currently compacting),
then we make sure that by compacting those into L1, we don't cause any overlap
in L1. We do that by checking first/last keys in the sstables
> Don't check for overlap with sstables that have had their start positions
> moved in LCS
> --------------------------------------------------------------------------------------
>
> Key: CASSANDRA-8739
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8739
> Project: Cassandra
> Issue Type: Bug
> Reporter: Marcus Eriksson
> Assignee: Marcus Eriksson
> Fix For: 2.1.3
>
> Attachments: 0001-8739.patch
>
>
> When picking compaction candidates in LCS, we check that we won't cause any
> overlap in the higher level. Problem is that we compare the files that have
> had their start positions moved meaning we can cause overlap. We need to also
> include the tmplink files when checking this.
> Note that in 2.1 overlap is not as big problem as earlier, if adding an
> sstable would cause overlap, we send it back to L0 instead, meaning we do a
> bit more compaction but we never actually have overlap.
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